Atomic Energy of Canada Limited

About: Atomic Energy of Canada Limited is a company organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Zirconium alloy & Neutron. The organization has 4845 authors who have published 4826 publications receiving 102951 citations.

X-ray magnetic scattering in antiferromagnetic URu2Si2.

Abstract: X-ray-resonance magnetic scattering has been used to study antiferromagnetic ordering in the small-moment (\ensuremath{\mu}\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\simeq}0.02${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$) heavy-fermion superconductor ${\mathrm{URu}}_{2}$${\mathrm{Si}}_{2}$. The intensity of the magnetic (003) reflection develops abruptly at ${\mathit{T}}_{\mathit{N}}$\ensuremath{\simeq}17 K and grows linearly to T=3 K, where it saturates. Long-range antiferromagnetic order (${\mathrm{\ensuremath{\zeta}}}_{003}^{\mathit{c}}$\ensuremath{\simeq}450 \AA{}) persists into the superconducting state at ${\mathit{T}}_{\mathit{c}}$=1.3 K demonstrating the microscopic coexistence of these two ground states. At saturation, a remarkable peak intensity of 8 counts/sec was measured.

DNA lesions that signal the induction of radioresistance and DNA repair in yeast.

Abstract: DNA recombinational repair, and an increase in its capacity induced by DNA damage, is believed to be the major mechanism that confers resistance to killing by ionizing radiation in yeast. We have examined the nature of the DNA lesions generated by ionizing radiation that induce this mechanism, using two different end points: resistance to cell killing and ability of the error-free recombinational repair system to compete for other DNA lesions and thereby suppress chemical mutation. Under the various conditions examined in this study, the "maximum" inducible radiation resistance was increased approximately 1.5- to 3-fold and suppression of mutation about 10-fold. DNA lesions produced by low-LET γ rays at doses greater than about 20 Gy given in oxygen were shown to be more efficient, per unit dose, at inducing radioresistance to killing than were lesions produced by neutrons (high-LET radiation). This suggests that DNA single-strand breaks are more important lesions in the induction of radioresistance than ...